In search of gems to complete her ornate Nightmare Night costume, Rarity accidentally finds herself transported to a world where a holiday not unlike Nightmare Night is less an event than a way of life - and her friends soon follow in hopes of rescuing her. Or, to put things more lyrically....

It was some time ago, but not too long, you see?
In a place that perhaps you have seen on TV.

For this story spans places far from pedestrian,
Crossing spooky and dark with bright and Equestrian.

Now, you may be asking how that crossing was done.
If you are not, I'd say it's time you begun!

(An excellent talking-book version of this story can be found here.)

In the many years after the Conversion Bureaus' shutdown, Twilight Sparkle is tasked by the Princesses with finding the last living human on Earth, Isaac Hamilton, and learning the story of his past. What she hears is a tale of loss, tragedy, joy, and the discovery of one's place in the world. But how much longer would that place last with what Twilight has to tell him?

Earth pony, pegasus pony, unicorn; a human entering a Conversion Bureau will end up as one of these three pony forms. But there is a secret provision, to which all Bureaus must adhere utterly, should one unlikely but intolerable transformation somehow occur. The absolute monarch of Equestria fears nothing from the human world. Nothing save this. Lillian Fogarty wanted only to be a simple pony in Equestria. Sought by the combined forces of Earth's corporate government and the might of Equestria itself she finds herself an abomination in both worlds, her survival almost certainly an impossibility.

♥ As Featured On Equestria Daily!

Life in Ponyville is wonderful for Twilight, but how was Twilight's life before it? A series of random one-shots showcasing Twilight's, Princess Celestia's and Spike's adventures before FiM.

A mysterious meteor has struck Sweet Apple Acres, one of multiple spots all over Equestria. At first, everypony thought it was harmless. But then green crystals started growing from the crater, leeching all the minerals and nutrients from the soil.

And everypony that came near or touched it started mutating or dying. And the alien substance continued to grow and expand, and nothing seems able to stop it.

An unknown figure then emerges: a maneless red pony with a black mustache and goatee, and an equally mysterious cutie mark of a scorpion tail inside a triangle, known only as Kane. He says the new substance is the harbinger of a new age, and all ponies should embrace it (carefully, of course), under the Ponyhood of Nod, an ancient and secret organization.

The Princesses Celestia and Luna disagree, and the Equestria Defense Initiative (EDI) is founded, and prepares to stop the Ponyhood, as well as the alien substance, which is quickly growing out of control.

Equestria has just entered the Tiberium Era. The question is: will they survive it?

After her students release the spirit of Discord on an official field trip, Cheerilee finds herself out of a job. With no opportunities in Ponyville, the schoolmare takes a job offer in the inner city area of Canterlot's old mining town. Can even she overcome the insanities of her colleagues and apathy of her students in time to pass her next annual review? And who is the mysterious backwards-talking filly following Cheerilee around? Luna's School for Disadvantaged Youngsters will never be the same!

Tv Tropes page can be found here.
Cover art based on work by blackgryph0n, used with permissiom.

Twilight's curiosity pushes her to go where no bookworm has gone before: on dates. Dates with lots of unfamiliar (and not so unfamiliar) mares. It goes about as well as you'd expect.

A parody of dating websites in general, named after eHarmony.

Cheerilee and Twilight Sparkle get together for an exam correcting session. What sound like a boring plan for a Sunday night turns into something else when Cheerilee and Twilight play Cheerilee's favourite game: The F-Grade Drinking Game.

Robert Parker is a 24 year old ex-web developer living in New York city. In the wake of the conversion movement, he has seemingly lost everything. Haunted by the same nightmare every night, he soon realizes that he must make a choice.

To those unfamiliar with the Conversion Bureau: it is a scenario created by an author named blaze in which Ponies either appear in the human world or have lived beside humans without incident for millennia. One day, in the face of all the damage humanity has done to its world, the ponies offer a solution: undergo conversion to become a pony and allow the world to be inundated with Equestria's influence: thus healing it and bring forth a golden age.

Many different authors have taken many different approaches to this idea, all of them are worth checking out.

http://www.ponychan.net/chan/fic/res/53616.html (The current thread)
http://www.equestriadaily.com/2011/04/conversion-bureau-compilation.html (The compilation post on EQDaily. *NOT UPDATED*)

It's a shipping story between Princess Luna and cellist pony Octavia, touching the theme of mortality versus immortality. What would go through your heart when you can't age but you see your loved one aging before your eyes?